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2003 European control Conference, ECC 2003

作者： Gil-Martínez, M. García-Sanz, M. System Engineering and Automation Group Electrical Engineering Department University of La Rioja Luis de Ulloa 20 Logroño26004 Spain Automatic Control and Computer Science Department Public University of Navarra Campus Arrosadía s/n Pamplona31006 Spain

ISBN: (纸本)9783952417379

When the process uncertainty size increases, even linear minimum phase systems must sacrifice desirable aggressive feedback control benefits to avoid an excessive 'cost of feedback', while preserving the robust stability. With a suitable uncertainty division and a QFT controller-prefilter to command each uncertainty subset inside a controller-scheduler structure, it is possible to enhance the feedback tracking performance without an excessive bandwidth. To preserve the robust stability from any failure in the switching, each controller is designed to be stable in the whole uncertainty domain, and as accurate in command tracking as desired in its uncertainty subset. © 2003 EUCA.

关键词： Robust control

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Anti-sway system for boom cranes based on an optimal control approach

Anti-sway system for boom cranes based on an optimal control...

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American control Conference (ACC)

作者： E. Arnold O. Sawodny A. Hildebrandt K. Schneider Fraunhofer Application Center Systems Technology Ehrenberg Germany Institute of Automation and System Engineering Department of Control Engineering Technische Universität Illmenau Germany

For the operation of boom cranes a significant high level of experience is needed to achieve a large amount of handled containers. Therefore, automation systems with anti-sway abilities for boom cranes were developed to increase the handling rate especially for inexperienced crane operators. In the paper, an optimal control approach is presented as an alternative to feedback control systems. After deriving the nonlinear dynamic model, the anti-sway problem is formulated as a nonlinear constrained optimal control problem. The numerical solution method for this optimal control problem is presented. The results are illustrated at measurements for the harbour mobile crane LIEBHERR LHM400.

关键词： Cranes Optimal control Feedback control Differential equations Shape control control systems automation State feedback Costs Nonlinear dynamical systems

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Component-based constructing approach for application specific embedded operating systems

Component-based constructing approach for application specif...

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International Conference on Intelligent Transportation

作者： Zhu Li-xin Wang Fei-yue Intelligent Control and System Engineering Center Automation Institute of Chinese Academy of Sciences Beijing China Department of Systems & lndustrial Engineering University of Arizona Tucson Tucson USA

ISBN: (纸本)0780381254

Rapid advances in the real-time embedded operating systems necessitate the development of Internet oriented application specific embedded operating systems. The ASOS (application specific embedded operating systems) has now become a promising research direction of the embedded operating system. The paper clarifies the concept of the ASOS, and takes the embedded operating system applied in the traffic signal controller we are now developing to illustrate the main characteristics of the ASOS. Benefits from the CBSE (component-based software engineering) include system quality improvement, shorter time to market, integration of complex systems, etc. However, as for the embedded system, the component-based technology and theories still in an exploration period, though many projects are carried on. In this paper, we present the process of our approach to construct the ASOS based on the component technology.

关键词： Operating systems Embedded system Application software Hardware systems engineering and theory Intelligent transportation systems Real time systems Internet control systems Software quality

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An infeasibility degree selection based genetic algorithms for constrained optimization problems

An infeasibility degree selection based genetic algorithms f...

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system Security and Assurance

作者： Mu, Sheng-Jing Su, Hong-Ye Chu, Jian Wang, Yue-Xuan Natl. Lab. of Indust. Cntr. Technol. Inst. of Adv. Process Control Zhejiang University Yuquan Campus Hangzhou 310027 China Natl. CIMS Engineering Res. Center Inst. of System Integration Department of Automation Beijing 100084 China

ISBN: (纸本)0780379527

In this paper, a genetic algorithm based on Infeasibility Degree (IFD) selection is proposed for constrained optimization problems. Initial solutions and intermediate solutions are allowed to be feasible as well as infeasible as penalty function methods. The infeasibility degree of a solution (IFD) is defined as the sum of the square value of all the constraints violation and the infeasibility degree selection of the population is designed through checking whether the IFD of a solution is less than or equal to a threshold value or not to decide the candidate solution is acceptable or refusable. The method is divided into two stages: first, initial IFD selection is carried out to produce enough initial feasible solution;then the GAs based on Annealing IFD selection is applied to search for the feasible optimum solution. Two selected problems are used to test the algorithm performance.

关键词： control system analysis

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On an explicit expression to compute H/sup /spl infin// norm of symmetric systems

On an explicit expression to compute H/sup /spl infin// norm...

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American control Conference (ACC)

作者： Lixin Gao Anke Xue Youxian Sun Wenzhou Norm College Institute of System Science Wenzhou Zhejiang China National Laboratoly of Industrial Control Technology University of Zhejiang Hangzhou China Automation Department Hangzhou Institute of Electronics Engineering Hangzhou China

ISBN: (纸本)0780378962

In this paper, an explicit expression to compute H/sup /spl infin// norm, which is recently obtained for continuous-time state-space symmetric systems by using a particular solution of the bounded real lemma for a symmetric system, is extended to more general case of continuous-time symmetric systems and also to discrete-time symmetric systems. The computations of H/sup /spl infin// norm only need to compute the maximum eigenvalue of a symmetric matrix, which only contains the system matrices.

关键词： Symmetric matrices Matrix decomposition Eigenvalues and eigenfunctions Open loop systems Singular value decomposition Linear matrix inequalities Riccati equations control system synthesis Output feedback Sun

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Plant Uncertainty Contribution to QFT Tracking control Design

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IFAC Proceedings Volumes 2003年第11期36卷 517-522页

作者： M. Gil-Martínez M. García-Sanz System Engineering and Automation Group Electrical Engineering Department University of La Rioja. Luis de Ulloa 20 26004 Logroño SPAIN. Tf.:+34 941 299496 Automatic Control and Computer Science Department Public University of Navarra. Campus Arrosadía s/n 31006 Pamplona SPAIN Tf.:+34 948 16938

Tracking feedback control trade-offs increase dangerously with arbitrarily large uncertainties in the process model. This is shown by the bounds in the QFT domain. In this context, the paper develops a theory on the contribution of the plant uncertainty to the tracking QFT bounds through a serious study of tracking bound formulas. From this, a methodology for uncertainty fragmentation is developed. It hopes to loosen the bound toughness, or the control design trade-offs. Better feedback benefits can be achieved while reducing the high-frequency amplification of noises and disturbances at the plant input at the same time. Different QFT controllers in a controller-scheduler structure should drive different uncertainty boundaries.

关键词： Quantitative Feedback Theory Robust control Uncertain Dynamical systems

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Linear ∞ Filter Design for a Class of Uncertain Nonlinear systems

Linear ∞ Filter Design for a Class of Uncertain Nonlinear S...

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42nd IEEE Conference on Decision and control

作者： Coutinho, Daniel F. Trofino, Alexandre Barbosa, Karina A. De Souza, Carlos E. Dept. of Electrical Engineering Pont. Univ. Católica-RS Av. Ipiranga 6881 Porto Alegre RS Brazil Dept. of Automation and Systems Univ. Federal de Santa Catarina PO Box 476 88040-900 Florianópolis SC Brazil Dept. of Information System Faculdades Barddal Av. Madre Benvenuta 416 Florianpolis SC Brazil Dept. of Systems and Control Lab. Nac. de Comp. Científica MCT Av. Getúlio Vargas 333 25651-075 Petrópolis RJ Brazil

This paper deals with the linear ∞ filtering problem for a class of regionally stable uncertain nonlinear systems subject to bounded disturbances and measurement noises. The nonlinear systems is represented by differential-algebraic equations where the system matrices are allowed to be rational functions of the state and uncertain parameters. For this class of systems, LMI conditions are proposed for ensuring a prescribed upper-bound on the L2-gain of the input-to-estimation error operator for a given linear asymptotically stable filter. The result is based on polynomial Lyapunov functions. Then, using an appropriate parameterization of the Lyapunov function we extend the analysis result for designing linear filters in a ∞ sense via a convex optimization problem.

关键词： Uncertain systems

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Short-term traffic flow prediction based on fuzzy time series

Short-term traffic flow prediction based on fuzzy time serie...

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International Body engineering Conference and Exhibition and Automotive and Transportation Technology Conference

作者： Gao, Haijun Li, Lingxi Chen, Long Liu, Rui Center of Intelligent Control and System Engineering Institute of Automation Chinese Academy of Sciences China Beijing Post and Telecommunication University China

Short-term traffic flow prediction is more and more important in intelligent traffic systems. This paper proposes a new traffic prediction model and algorithms based on it, at last we use the data of the Zizhu bridge ... 详细信息

关键词： Forecasting

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Robust specification influence on feedback control strategies 15th

Robust specification influence on feedback control strategie...

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15th World Congress of the International Federation of Automatic control, 2002

ISBN: (纸本)9783902661746

The feedback control structures are required in the presence of any kind of uncertainty. The benefits of the feedback are mainly paid with an excessive bandwidth that amplifies the sensor noise, saturating the actuators. This implies the necessity of design tradeoffs highly transparent from the Quantitative Feedback Theory. Supposing a given uncertainty for a plant, the set of performance and stability requirements will condition the problem solution. Taking advantage of the QFT bound typology and formulation, the contribution of the robust specification values to their simultaneous achievement will be analysed and particularly as regards the challenging task of the controller design. Copyright © 2002 IFAC.

关键词： controllers

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ROBUST SPECIFICATION INFLUENCE ON FEEDBACK control STRATEGIES

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IFAC Proceedings Volumes 2002年第1期35卷 425-430页

作者： M. Gil-Martínez M. García-Sanz System Engineering and Automation Group Electrical Engineering Department University of La Rioja. Luis de Ulloa 20 26004 Logroño SPAIN Automatic Control and Computer Science Department Public University of Navarra. Campus Arrosadía 31006 Pamplona SPAIN

关键词： Robust control Uncertain dynamical systems Quantitative Feedback Theory

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